Apple II

Hello, hoping someone can set me on the right path, my knowledge is limited as the las time I played with an Apple II I was a student in Jr. High in the computer class run by Mrs. Quigley.  A bit of backstory in case it'll help.  A B&H Apple II came to me with a dead power supply, and only one ROM CARD 600 in it.

I tried repairing the power supply with a capacitor kit but was ultimately unsuccessful.  I ended up getting a replacement PSU from ReActive, and that got the Apple II booting up to a garbage screen to the monitor prompt.

I have two 800K 3.5" drives and one 5.25" drive for my Apple IIGS. However, I can't seem to use any 800K 3.5" disks. It's like it can't find it, or it doesn't work, and I've tried both 3.5" drives. I even tried just having one 3.5" drive connected, and no other drives, and it still wouldn't see or load anything from any of the disks.

I have a Microsoft Softcard III CP/M card with the manuals and disks in original box that i want to sell.

Obviously i know the card can't be used, but can my Enhanced //e with Disk ]['s or DuoDisc (i have both) read Apple /// disks to verify there's still something on them?

I recall reading this somewhere online recently, but wanted to confirm before i try it and possibly destroy the disks.

Has anyone ever come across a Geiger counter that works with Apple II? I remember seeing one in an episode of Mr. Wizard (season 4 ep 13), but I've never actually seen the peripheral or the software. I can't find a clip online but I'll upload a screenshot in horrible definition. It might have a dedicated peripheral card too, the cable is RJsomething though I suppose it could just be using a DB9-RJ45 adapter.